Pressure pump



Sept. 7, 1937.

J. S. RODGERS PRESSURE PUMP Filed Nov. 6, 1955 2 SheetsSheet l JIMEJ 61 00652;

Arnie/ways Sept. 7, 1937. J. s. RODGERS 2,092,738

PRESSURE PUMP Filed Nov. 6, 1935 2 Sheets-Sheet 2 J. leoosfea UNITED STATE 5 PATENT O 'FFIC E PRESSURE PUMP James: S. Rodgers, Minneapolis,.,Minn., assignor "to Rodgers Hydraulic Incorporated, Minneapolis, Minn., a corporation of Minnesota Application November 6, 1935, Serial No; 48,532

This invention relates to 5 Claims.

new and useful impiston thereof in accordance with the load to be moved;

Afurther' object ofthe invention is to provide a pressure pump particularly adapted for supplying a pressure fluidto a hydraulic ram or press under great pressurehaving a piston provided with an operating mechanism comprising an operating handle having one end supported in a sleeve, which is p-ivotally mounted upon the upper ends of a pair, oflinks, the lower ends of which are pivotally supported on the upper portion of the pump cylinder, and said sleeve being relatively slidable upon the handle to thereby increase or decrease the leverage between the operating handle andthe piston of the pump.

Other objects reside in the tion of' the supporting. means of the operating comprises a pair of links each having. one end pivotally connected handle of the pump, which particular constructo the operating handle and having their'opposite ends pivotally connected to upright fixed portions of the upper portion ofthe pump cylinder; which links prevent relative longitudinal movement of the operating handle; in the unique construction and arrangement of the sleeve for supporting the operating handle; and, in the means for looking the sleeve in: adjustedposition upon'the oper= ating handle, whereby the, transmitted to. the pump. piston may be varied on leverage or power increased in accordance with thepress'ure required.

Other objects of the invention will the following.- description.

claims;

In the accompanying. drawings there has been disclosed a structure designedte-carry out the various objects of the invention, but it is to-be understood that the invent-iorrisnotconfined to the exact features" shown as various changes -may i be made wi-thin' the scope-of the claims which on. of the improved appear from and: accompanying drawings and will be pointed outin the annexed.

pump partially in section, showing the general construction thereof;

Figure 2.is; a side elevation of the pump; Figure 3 is a View looking at the pump from the right hand side of Figure 2 with some of the parts omitted and others partially broken away to more clearly show the construction of the means for supporting the upright arms upon the upper ends of which the handle supporting means, is carried;

Figured is a; sectional plan, view substantially on the line i--4of Figure 2; and

Figure 5- is a detail. sectionalview showing the operating mechanism adjusted for maximum leverage.

In the selected embodiment of the invention here shown, there is illustratedin Figures 1 and 2, for purposes of disclosure, an upright casing 2, preferably cylindricalin cross-section and' having a suitable base 3; A. suitable head" 4"is secured to the upper end of the casing 2" to provide a closure therefor;

A casting H] is disposed within the casing 2 and has a bore 5 which preferably is axially alined with'the casing 2. The bore 5 communicates at its lower end with a valve chamber 6, thelower' endrof' which is closed" by'a suitable plug-l" having a valve opening. Btherei'n normally closed by a suitable, check valve 9". A relatively smaller valve chamber communicates with the valve chamber-'6 through a duct I2, and'is nor mally closedzby a check valve I3! The valve i3 is retained in closedlposition by a springjl l. having oneend engaged with the head l5"ofl a suit-' able stem i6; andiitsupper end'engaging a plug IT received in threaded engagement with the casting H), as shown. A tube l8 has one end secured to the plug IT and" extends"; upwardly through a suitable aperture providedin thehead l of thecasing. This tubeor conduit may; have a pipe IQconnecting it to a suitable press, generally indicatedby the numeralZU'in Figure 4:. A pipe 2|, shown in dotted'linesin Figure 4; leads from the press ZUft-o an upright pipe. 22 communicating with the interior of the casing 2; The pipe, 21' provides a return for the fluid pumped into the press 20, and circulation throughthe return pipe 2] maybe controlled by asuitable valve, generally indicated by the numeraljrfi". V

A suitable piston 24 is'mounted for reciprocal movementin. the bore 5]. and is adapted, when moved upwardly; to draw fluid from the casing 2" into the valve chamber 6; and when moved downwardly, to force the fluidfrom thevalve chamber, 6' through the duct 12 and into the valve chamher whence it is forced upwardly through the pipe I8 and through the pipe I9 to the press 20. The casting I0 is shown supported upon suitable lugs 25 provided on the base 3 of the casing 2, to permit free circulation of the fluid beneath the casting, as clearly illustrated in Figure 1.

An important feature of this invention resides in the means provided for operating the piston 24. The power pump herein disclosed, is particularly applicable for use in connection with hydraulic presses of the general character disclosed in my pending application, Serial No. 717,334, filed March 26, 1934. Such presses are frequently subjected to extremely heavy loads, and it is therefore desirable when the press is to be actuated by a manually operable pump, that means be provided in the construction of the pump, whereby the leverage between the operating handle and the piston may be varied in accordance with the load to be moved by the press.

To thus vary the leverage between the piston and the operating handle 26, a suitable sleeve 21 is mounted for sliding movement upon the reduced end portion 28 of the operating handle 26. A latch member 29 is pivotally mounted upon the sleeve 21 and has a spring 3| normally holding it in looking engagement with one of a plurality of notches 32 provided in the reduced portion 28 of the operating handle. The latch member 29 has a suitable hand grip 33, whereby it may be conveniently moved out of engagement with the notches 32, thereby to permit the sleeve to be longitudinally moved upon the portion 23 of the operating handle, as will readily be understood by reference to Figures 1 and 2.

The sleeve 21 is pivotally supported upon the upper ends of a pair of arms 34 by suitable pivots 35, and the lower ends of these arms are supported upon suitable pivots 36 mounted in the upright members 37, shown integrally formed with the head 4 of the casing 2. A connecting rod 38 has its lower end operatively connected to the upper end of the piston 24 by a suitable pivot 39, and the upper end of the connecting rod is operatively connected to the handle 26 by a pivot 4|.

Means are provided for preventing relative longitudinal movement of the handle 26 with respect to the casing 2, when the sleeve 21 is relatively adjusted thereon. Such means are clearly illustrated in Figures 2, 4, and 5, and may consist of a pair of links 42 having their left hand ends, when viewed as shown in Figure 4, pivotally connected to the upper ends of the upright members or lugs 37 by suitable pivots 43. The opposite ends of the links 42 are operatively connected to the reduced end portion 28 of the operating handle 26 by such means as a bolt 44 and spacing collars 45, the latter having reduced portions 46 received in suitable apertures in the links 42. The end portion 28 of the operating handle is preferably flattened upon opposite sides, as shown at 41 in Figure 4, whereby the spacing collars 45 may be securely clamped thereagainst by the nut 48 of the bolt 44. The links 42 are free to rotate upon the reduced end portions 46 of the spacing collars 45.

The sleeve 21 provides means whereby the leverage between the operating handle 26 and the piston 24 may be quickly varied or adjusted to adapt the pump for different loads. For example, when the latch member 29 is positioned in the notch 32, nearest to the end or terminal 49 of the operating handle 26, the apparatus will be adjusted for minimum leverage, which results because of increasing the distance between the axes of the pivots 35 and 4|, which increases the stroke of the piston 24 for a given stroke of the operating handle 26.

Conversely, when the latch member 29 is shifted from the notch nearest to the terminal 49 of the operating handle to the notch nearest the pivot 4|, the distance between the axes of the pivots 35 and 4| will be decreased, whereby the leverage between the piston 24 and the operating handle 26 is materially increased because of the stroke of the piston 24 being considerably shorter for a given stroke of the operating handle 26, assuming, of course, that the stroke of the operating handle is substantially the same, regardless of the position of the latch member 29. It will be noted by reference to Figures 1 and 2, that the position of the operating handle 26 with respect to the casing 2, is always substantially the same, as a result of the links 42 preventing relative longitudinal movement of the operating handle.

Vhen operating a hydraulic press, it is desirable to have a pressure pump, the stroke of which may be varied, as herein disclosed, because, when the ram or plunger of the press is initially started, the load is comparatively light, which permits the piston 24 of the pump to be operated at maximum stroke until the load on the press increases to a point where it requires considerable eifort to oscillate the operating handle 26 of the pump. When the load on the press thus increases, the latch member is moved towards the swinging end of the operating handle, whereby the distance between the axes of the pivots 35 and 4| is shortened, as hereinbefore stated, with the result that the stroke of the piston 24 for a given stroke of the operating handle 26 is decreased, thereby increasing the leverage between the pump and the :landle.

Thus, it will readily be seen that the leverage between the piston and the operating handle may be quickly and conveniently changed from time to time, when necessary, and without loss of time, whereby a very practical and efficient apparatus is provided. The operating mechanism of the piston 24 is also comparatively simple in construction, whereby the apparatus may be manufactured at small cost, which is a desirable feature in apparatus of this general character. The handle 33 of the latch member 29, in addition to providing means for conveniently actuating the latch, also provides a handle for facilitating moving the pump from place to place.

I claim as my invention:

1. An operating mechanism for imparting reciprocal movement to a member, comprising a supporting structure, a lever operatively connected to the member, a sleeve pivotally sup ported at the upper ends of a pair of oscillatable arms, said sleeve slidably receiving one end of the lever to provide a pivotal support therefor, said lever having a plurality of notches therein, means on the sleeve engageable with said notches to lock the sleeve in adjusted position upon the lever, and whereby the mechanism may be adjusted to increase or decrease the leverage between the reciprocal member and the operating lever for a given stroke of the lever, and means operatively connecting the lever to the supporting structure and permitting normal oscillatory movement of the lever while preventing substantially all longitudinal movement thereof.

2. An operating mechanism for imparting reciprocal movement to a member, comprising a lever operatively connected to the member, a

, sleeve pivotally supported at the upper ends of a pair of oscillatable arms, said sleeve slidably receiving one end of the lever to provide a pivotal support therefor, said lever having a. plurality of notches therein, and a latch member on the sleeve engageable with said notches to lock the sleeve in adjusted position on the lever, and whereby the mechanism may be adjusted to increase or decrease the leverage between the reciprocal member and the operating lever for a given stroke of the latter, and a link having one end pivotally connected to the lever and its opposite end to a fixed member and arranged to permit normal oscillatory movement of the lever while preventing substantially all longitudinal movement thereof.

3. An operating mechanism for imparting reciprocal movement to a member, comprising a lever operatively connected to the member, a 0 sleeve pivotally supported at the upper ends of a pair of oscillatable arms, said sleeve slidably receiving one end of the lever to provide a pivotal support therefor, said lever having a plurality of notches therein, a pivoted latch member on the sleeve engageable with said notches to lock the sleeve in adjusted position on the lever, and whereby the mechanism may be adjusted to increase or decrease the leverage between the reciprocal member and the operating lever for a 30 given stroke of the latter, and a link having one end pivotally connected to the lever and its opposite end to a fixed member and arranged to permit normal oscillatory movement of the lever while preventing substantially all longitudinal movement thereof.

4. In an apparatus of the class described, a supporting structure, a member mounted for reciprocal movement therein, an operating lever, a link having one end pivoted to the operating 40 lever and its opposite end to the supporting structure and disposed in substantially parallel relation to the lever, a pivot connecting the member to the operating lever and spaced inwardly from the pivotal connection of said link with the lever,

a slide mounted for longitudinal adjustment on the lever and comprising oppositely disposed trunnions, upright arms pivoted at their lower ends to the supporting structure and having their upper. ends receiving said trunnions, said trunnions being located between the pivotal connection of said link with the lever and the pivot connecting the member thereto, and means for longitudinally adjusting the slide on the lever, thereby to vary the distance between said trunnions and said pivot and whereby the stroke of said member may be varied for a given stroke of the operating lever, said means comprising a locking device carried by the slide and adapted to be actuated to secure the slide against longitudinal movement on the lever.

5. In an apparatus of the class described, a supporting structure, a member mounted for reciprocal movement therein, an operating lever, a link having one end pivoted to the operating lever and its opposite end tothe supporting structure and disposed in substantially parallel relation to the lever, a pivot connecting the member to the operating lever and spaced inwardly from the pivotal connection of said link with the lever, a slide mounted for longitudinal adjustment on the lever and comprising oppositely disposed trunnions, upright arms pivoted at their lower ends to the supporting structure and having their upper ends receiving said trunnions, said trunnions being located between the pivotal connection of said link with the lever and the pivot connecting the member thereto, and means for longitudinally adjusting the slide on the lever,

comprising a latch mounted on the slide and adapted to engage notches in the lever, and whereby the distance between said trunnions and said pivot may be varied to increase or decrease the stroke of said member for a given stroke of the operating lever. 7

JAMES S. RODGERS. 

